Adding-machine.



J. PALLWEBER. ADDING MACHINE.

APPLICATION FILED MAY13, 1904.

PATENTED FEB. 27. 1906.

2 SHEETS-SHEET 1.

, j M Z J. PALLWEBBR. ADDING MACHINE.

APPLICATION FILED MAY 13, 1904.

PATENTED FEB. 27. 1906.

2 SHEETS-SHEET. 2.

35 throu hthe is a .Fig

JOSEPH PALLWEBER, or MANNHEIM, GERMANY.

ADDING-MACHINE.

.' Specification of Letters Patent.

Yatented Feb. 27, 1906;

application filed May 15,1904. Serial No. 207,83--= To all whom it may concerns Be itknown that I, J ossrn PAiJLWEBE'R, a subject ofthe German Emperor, and a resident of Mannheim, German Improvements inAddingachine's, the following is a s ecification. This invention reFates to an improved adding-machine.

of which Adding machines which the figureupon the return motion. .motlon 1s wheels areactuated by means of keys,,levers, and stopawls are well known. Among other publications the German Patent No. 65,597 describes a machine of. this kind. It is, however, im ortant for all these machines to .work silent y, because any noise would disturb the operator and others workin in the same room; but up to the present it ias 'been impossible to avoid this'inconven1ence,-

because of the stopawls operating the sets of wheels, which w en pressed against the teeth by means of springs roduce a rattle en the return limited by a stop, a violent shock takes place at each operation, accompanied by a-noise' which'has a tendency to cause the premature deterioration and putting out of order of the entire mechanism; The control of the adding1 mechanismis also in many 08,868 arrange v ing of the pawls, as well as o encyX of t ewheel y when t f 1 zontally,

9*2. The shifting in such a manner that a rela- 'tively heav I pressure is required to move the keys, there "y easily constituting a reason for the 0 erator pressing much too heavily upon the -eys.' 4. In the annexed drawings, given by way of example, .Fi ure 1 shows a cross-section eys and control-slide a. Fig. 2 p an view of the complete mechanism. 3 shows a front view of the apparatus with the control-slide a. Fig 4 shows in side view how the' stop-pawl 0 engages against the smallplate q and in the toothed wheel Fig. 5" shows the same part upon a lar er scale. Fig. 6 is a perspective-view of the evice partly broken away.

T e noiseless or practicall the keys, .(numbered 1 to 9-, inclusive,) is obtained in my machine b giving to the stop-pawl 0,wh1ch 1S held loose y at one end u on the lever 'n'by means of two studs 6, su cient play so that by its own weight its opposite en has atendto fall into the s ace between the. teeth or substantially so, as seen in Fig. of the pawl over the teeth is have invented a said plate,

noiseless workconnected e device is lying horn T a supporting-shaft a, such that hardly any no seis produced. The upon one end of a flat spring lever n is loosel mounted on the shaft n of the gear-whee g of the said gearwheels shown and is adaptedfor oscillation on said shaft n In-orderto limit the movement of the stop-pawl 0, the latter works in conjunction with a small plate g, secured to the back late'gflone end of which plate 9' is bent ob' iquely upward, so that the stop-pawl enters likea Wedge into the tapered spacebeneath and-thejlatter acting like a stop deadens all-shocks and also stops further oscillation of the lever n. tion of the keys and working of the a ding mechanism is obtained by employing the con-. trol-slide a, arranged to bear atone end upon a roller 1) and the shifting whereof is obtained by keys 01;, of which there arejnine number and whichbearin their descending motion upon the inclined surfaces or' edges 0 of the teeth 0, and thus move the slide more or less to one side. 'The inclined edges or surfaces 0 of the teeth have successively increasing inclinations, beginnin with the' No. 1 at one extremity of the U evice and ending with the ke No. 9 atthe otherextremity, so that when ey 1 is depressed it acts .to' move thea slide a' the minimum distance, so as to cause the lever n to be oscillated just enough to cause the gear-wheelgto move a distance of one tooth only, so that when the key is re- The easy mani ulaleased the slide willbe movedreversely, thus a the lever n to oscillate reverse and the pawl '0, which has previously dropped into the space betweenftwo of the teeth, will cause the gear-wheel to'be turned a distance causing of'one tooth, and therefore thismovement of the ear-wheel g will be transmitted to a suitsble' indicating dial or disk], (Not shown.) When key. 2 is depressed, it will move the slide just twice the distance that key 1 did and cause lever n ciently to cause the wheel 9' to be moved a distance of two teethby the pawl 0 when the key 2 is-released, and soon. i A s ring (1 has a constant tendency to move the s ide-in a di rection. the reverse' of moved when a key'is depressed and to move the keys upward again when released by the finger. A link 0' establishes the connection between the stop-pawl and the slide by being atone end with the arm n of lever end'with the slide.

To facilitate the upward movement of each; of the keys, each key at one end is bent around and the bent end bears which-at-the n and at the other IQC that in which it is other end is secured to a bar f Thus when other end with the teeth of said ear-wheeLa a key is depressed by the finger the spring f slide having teeth each provide with an inwill be flexed, and when the key is released clinededge, keys arranged to hear u on the from the pressure of the finger-the tension of J inclined edges of the teeth and shiftt e slide,

the spring f causes the key to rise, this acf when said keys are depressed, alinkconnecttion of the spring being supplemented by the .ed at one end with an arm of the oscillatable tension of the spring ,-.which causes the inlever and at'the other end with slide, and olined surface of the slide a to bear against a plate q bent as' described and with'which the edge of the key. the pawl is adapted to engage in thex manuer 2 5 hat I claim is and for the purpose specifiu I An adding machine comprising a set of Intestimony whereof I have hereunto set toothed intermeshing wheels and o erating my hand in presence of two witnesses;

means therefor comprising a lever oscillatably JOSE PH FALL-WEB Eli. mounted on the shaft of one of the toothed Witnesses:

Wheels, a pawl loosel connected at one end H. W. HARRIS,

with the lever and adhpted to engage at the l 4 JOSEPH H. LEUTE'. 

